A parameterization of aerosol activation: 2. Multiple aerosol types

Hayder Abdul‐Razzak; Steven J. Ghan

doi:10.1029/1999jd901161

journal article Mar 01, 2000

A parameterization of aerosol activation: 2. Multiple aerosol types

Hayder Abdul‐Razzak Steven J. Ghan

Journal of Geophysical Research: Oceans Vol. 105 No. D5 pp. 6837-6844 · American Geophysical Union (AGU)

View at Publisher Save 10.1029/1999jd901161

Abstract

A parameterization of the activation of a lognormal size distribution of aerosols to form cloud droplets is extended to the case of multiple externally mixed lognormal modes, each composed of a uniform internal mixture of soluble and insoluble material. The Köhler theory is used to relate the aerosol size distribution and composition to the number activated as a function of maximum supersaturation. The supersaturation balance is used to determine the maximum supersaturation, accounting for particle growth both before and after the particles are activated. Comparison of the parameterized activation of two competing aerosol modes with detailed numerical simulations of the activation process yields agreement to within 10% under a wide variety of conditions, including diverse size distributions, number concentrations, compositions, and updraft velocities. The parametization error exceeds 10% only when the mode radius of the two size distributions differs by an order of magnitude. Errors for the mass fraction activated are always much less than errors for the number fraction activated.

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References

Details

Published: Mar 01, 2000
Vol/Issue: 105(D5)
Pages: 6837-6844
License: View

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Cite This Article

Hayder Abdul‐Razzak, Steven J. Ghan (2000). A parameterization of aerosol activation: 2. Multiple aerosol types. Journal of Geophysical Research: Oceans, 105(D5), 6837-6844. https://doi.org/10.1029/1999jd901161

A parameterization of aerosol activation: 2. Multiple aerosol types

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